ISLAMABAD Pakistan's interior minister said on Tuesday he could not confirm that Afghan Taliban leader Mullah Akhtar Mansour had been killed in a U.S. drone strike, and described Washington's justification for the attack as "against international law".

U.S. President Barack Obama said on Monday that Mansour had been killed in the drone strike, and the Pentagon said separately that Mansour was plotting attacks that posed "specific, imminent threats" to U.S. troops in Afghanistan.